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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | // SPDX-License-Identifier: GPL-2.0-or-later /* * (c) 1997-1998 Grant R. Guenther <grant@torque.net> * * comm.c is a low-level protocol driver for some older models of the DataStor * "Commuter" parallel to IDE adapter. Some of the parallel port devices * marketed by Arista currently use this adapter. */ #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/wait.h> #include <asm/io.h> #include "pata_parport.h" /* * mode codes: 0 nybble reads, 8-bit writes * 1 8-bit reads and writes * 2 8-bit EPP mode */ #define j44(a, b) (((a >> 3) & 0x0f) | ((b << 1) & 0xf0)) #define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4); #define P2 w2(5);w2(7);w2(7);w2(5);w2(4); /* * cont = 0 - access the IDE register file * cont = 1 - access the IDE command set */ static int cont_map[2] = { 0x08, 0x10 }; static int comm_read_regr(struct pi_adapter *pi, int cont, int regr) { int l, h, r; r = regr + cont_map[cont]; switch (pi->mode) { case 0: w0(r); P1; w0(0); w2(6); l = r1(); w0(0x80); h = r1(); w2(4); return j44(l, h); case 1: w0(r+0x20); P1; w0(0); w2(0x26); h = r0(); w2(4); return h; case 2: case 3: case 4: w3(r+0x20); (void)r1(); w2(0x24); h = r4(); w2(4); return h; } return -1; } static void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val) { int r = regr + cont_map[cont]; switch (pi->mode) { case 0: case 1: w0(r); P1; w0(val); P2; break; case 2: case 3: case 4: w3(r); (void)r1(); w4(val); break; } } static void comm_connect(struct pi_adapter *pi) { pi->saved_r0 = r0(); pi->saved_r2 = r2(); w2(4); w0(0xff); w2(6); w2(4); w0(0xaa); w2(6); w2(4); w0(0x00); w2(6); w2(4); w0(0x87); w2(6); w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4); } static void comm_disconnect(struct pi_adapter *pi) { w2(0); w2(0); w2(0); w2(4); w0(pi->saved_r0); w2(pi->saved_r2); } static void comm_read_block(struct pi_adapter *pi, char *buf, int count) { int i, l, h; switch (pi->mode) { case 0: w0(0x48); P1; for (i = 0; i < count; i++) { w0(0); w2(6); l = r1(); w0(0x80); h = r1(); w2(4); buf[i] = j44(l, h); } break; case 1: w0(0x68); P1; w0(0); for (i = 0; i < count; i++) { w2(0x26); buf[i] = r0(); w2(0x24); } w2(4); break; case 2: w3(0x68); (void)r1(); w2(0x24); for (i = 0; i < count; i++) buf[i] = r4(); w2(4); break; case 3: w3(0x68); (void)r1(); w2(0x24); for (i = 0; i < count / 2; i++) ((u16 *)buf)[i] = r4w(); w2(4); break; case 4: w3(0x68); (void)r1(); w2(0x24); for (i = 0; i < count / 4; i++) ((u32 *)buf)[i] = r4l(); w2(4); break; } } /* NB: Watch out for the byte swapped writes ! */ static void comm_write_block(struct pi_adapter *pi, char *buf, int count) { int k; switch (pi->mode) { case 0: case 1: w0(0x68); P1; for (k = 0; k < count; k++) { w2(5); w0(buf[k ^ 1]); w2(7); } w2(5); w2(4); break; case 2: w3(0x48); (void)r1(); for (k = 0; k < count; k++) w4(buf[k ^ 1]); break; case 3: w3(0x48); (void)r1(); for (k = 0; k < count / 2; k++) w4w(swab16(((u16 *)buf)[k])); break; case 4: w3(0x48); (void)r1(); for (k = 0; k < count / 4; k++) w4l(swab16(((u16 *)buf)[2 * k]) | swab16(((u16 *)buf)[2 * k + 1]) << 16); break; } } static void comm_log_adapter(struct pi_adapter *pi) { char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" }; dev_info(&pi->dev, "DataStor Commuter at 0x%x, mode %d (%s), delay %d\n", pi->port, pi->mode, mode_string[pi->mode], pi->delay); } static struct pi_protocol comm = { .owner = THIS_MODULE, .name = "comm", .max_mode = 5, .epp_first = 2, .default_delay = 1, .max_units = 1, .write_regr = comm_write_regr, .read_regr = comm_read_regr, .write_block = comm_write_block, .read_block = comm_read_block, .connect = comm_connect, .disconnect = comm_disconnect, .log_adapter = comm_log_adapter, }; MODULE_LICENSE("GPL"); MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver"); module_pata_parport_driver(comm); |